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From: Dan Williams <dan.j.williams@intel.com>
To: akpm@linux-foundation.org
Cc: Joao Martins <joao.m.martins@oracle.com>,
	peterz@infradead.org, vishal.l.verma@intel.com,
	dave.hansen@linux.intel.com, ard.biesheuvel@linaro.org,
	vishal.l.verma@intel.com, linux-mm@kvack.org,
	linux-nvdimm@lists.01.org, joao.m.martins@oracle.com,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	dri-devel@lists.freedesktop.org
Subject: [PATCH v3 22/23] dax/hmem: Introduce dax_hmem.region_idle parameter
Date: Fri, 31 Jul 2020 20:27:01 -0700
Message-ID: <159625242170.3040297.12358143576736600455.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <159625229779.3040297.11363509688097221416.stgit@dwillia2-desk3.amr.corp.intel.com>

From: Joao Martins <joao.m.martins@oracle.com>

Introduce a new module parameter for dax_hmem which
initializes all region devices as free, rather than allocating
a pagemap for the region by default.

All hmem devices created with dax_hmem.region_idle=1 will have full
available size for creating dynamic dax devices.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/r/20200716172913.19658-4-joao.m.martins@oracle.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/dax/hmem/hmem.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
index 1a3347bb6143..1bf040dbc834 100644
--- a/drivers/dax/hmem/hmem.c
+++ b/drivers/dax/hmem/hmem.c
@@ -5,6 +5,9 @@
 #include <linux/pfn_t.h>
 #include "../bus.h"
 
+static bool region_idle;
+module_param_named(region_idle, region_idle, bool, 0644);
+
 static int dax_hmem_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -30,7 +33,7 @@ static int dax_hmem_probe(struct platform_device *pdev)
 	data = (struct dev_dax_data) {
 		.dax_region = dax_region,
 		.id = -1,
-		.size = resource_size(res),
+		.size = region_idle ? 0 : resource_size(res),
 	};
 	dev_dax = devm_create_dev_dax(&data);
 	if (IS_ERR(dev_dax))



  parent reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-01  3:24 [PATCH v3 00/23] device-dax: Support sub-dividing soft-reserved ranges Dan Williams
2020-08-01  3:25 ` [PATCH v3 01/23] x86/numa: Cleanup configuration dependent command-line options Dan Williams
2020-08-01  3:25 ` [PATCH v3 02/23] x86/numa: Add 'nohmat' option Dan Williams
2020-08-01  3:51   ` Randy Dunlap
2020-08-01 16:36     ` Dan Williams
2020-08-01  3:25 ` [PATCH v3 03/23] efi/fake_mem: Arrange for a resource entry per efi_fake_mem instance Dan Williams
2020-08-01  3:25 ` [PATCH v3 04/23] ACPI: HMAT: Refactor hmat_register_target_device to hmem_register_device Dan Williams
2020-08-01  3:25 ` [PATCH v3 05/23] resource: Report parent to walk_iomem_res_desc() callback Dan Williams
2020-08-01  3:25 ` [PATCH v3 06/23] mm/memory_hotplug: Introduce default phys_to_target_node() implementation Dan Williams
2020-08-01  6:24   ` kernel test robot
2020-08-01 16:39   ` kernel test robot
2020-08-01  3:25 ` [PATCH v3 07/23] ACPI: HMAT: Attach a device for each soft-reserved range Dan Williams
2020-08-01  3:25 ` [PATCH v3 08/23] device-dax: Drop the dax_region.pfn_flags attribute Dan Williams
2020-08-01  3:25 ` [PATCH v3 09/23] device-dax: Move instance creation parameters to 'struct dev_dax_data' Dan Williams
2020-08-01  3:25 ` [PATCH v3 10/23] device-dax: Make pgmap optional for instance creation Dan Williams
2020-08-01  3:26 ` [PATCH v3 11/23] device-dax: Kill dax_kmem_res Dan Williams
2020-08-01  3:26 ` [PATCH v3 12/23] device-dax: Add an allocation interface for device-dax instances Dan Williams
2020-08-01  3:26 ` [PATCH v3 13/23] device-dax: Introduce 'seed' devices Dan Williams
2020-08-01  3:26 ` [PATCH v3 14/23] drivers/base: Make device_find_child_by_name() compatible with sysfs inputs Dan Williams
2020-08-01  3:26 ` [PATCH v3 15/23] device-dax: Add resize support Dan Williams
2020-08-01  3:26 ` [PATCH v3 16/23] mm/memremap_pages: Convert to 'struct range' Dan Williams
2020-08-01  3:26 ` [PATCH v3 17/23] mm/memremap_pages: Support multiple ranges per invocation Dan Williams
2020-08-01  3:26 ` [PATCH v3 18/23] device-dax: Add dis-contiguous resource support Dan Williams
2020-08-01  3:26 ` [PATCH v3 19/23] device-dax: Introduce 'mapping' devices Dan Williams
2020-08-01  3:26 ` [PATCH v3 20/23] device-dax: Make align a per-device property Dan Williams
2020-08-01  7:23   ` kernel test robot
2020-08-01  3:26 ` [PATCH v3 21/23] device-dax: Add an 'align' attribute Dan Williams
2020-08-01  6:14   ` kernel test robot
2020-08-01  6:18   ` kernel test robot
2020-08-01  3:27 ` Dan Williams [this message]
2020-08-01  3:27 ` [PATCH v3 23/23] device-dax: Add a range mapping allocation attribute Dan Williams
2020-08-04 17:02 ` [PATCH v3 00/23] device-dax: Support sub-dividing soft-reserved ranges Jason Gunthorpe

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